Wang Hailang, a senior engineer of Polar Research Institute of China, introduces the operation area of moon-pool of polar icebreaker "Xuelong 2" in east China's Shanghai, July 11, 2019. China's first domestically built polar icebreaker "Xuelong 2," or "Snow Dragon 2," was delivered on Thursday in Shanghai, according to the Ministry of Natural Resources. On its maiden voyage later this year, the ship will sail for Antarctica together with "Xuelong," the only Chinese icebreaker in service, in the country's 36th research mission to the region. (Xinhua/Zhang Jiansong)